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I have run both the sdkmanager command line, and the SDK Manager throuhg Visual Studio to add 28 but still it will not show in my properties in Visual Studio.

enter image description here

If I manually change it in the .csproj, I get:

Project [PROJECT] cannot build using TargetFrameworkVersion v9.0 because it s not supported. Please change your Xamarin.Android project to target an API version that is supported.

What am I missing? How can I get Visual Studio/Xamarin to recognize that it is installed?

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    I didn't install SDK Platform 28 but I can choose it as Target Framework. Did you check VS for updates? Commented Dec 6, 2018 at 17:00
  • I do need an update, I will give that a try Commented Dec 6, 2018 at 17:24
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    Hey, were you able to find a solution? I have the same problem on Visual Studio 2019 (just released) Commented Apr 4, 2019 at 10:56
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    I don't remember what I had done, it involved installing the newest version of something... dammit, sorry, I wish I had recorded it - I forgot this was up. Commented Apr 5, 2019 at 15:35

1 Answer 1

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please follow this link may it help you 

https://forums.xamarin.com/discussion/129245/project-xyz-droid-cannot-build-using-targetframework-v8-1-because-it-is-not-supported-error

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